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    INVESTIGATION OF THE EFFECT OF MICRO ARC OXIDATION AND SHOT PEENING ON CORROSION AND WEAR BEHAVIOR OF AZ31-xLa and AZ31-xNd ALLOYS
    (2020-08-07) Elmensouri, Galal Amhmed
    To reduce the CO2 emission and to increase the energy efficiency, the using of magnesium alloys as a light material in automotive and space industries is important due to their low density of 1,74 g/cm3 and high specific strength. Moreover, as biomaterial the Mg alloys is an important candidate due to their corrosion resistance could be control thanks to alloying elements or surface modifications. Furthermore, the rare earth metals are the excellent texture modifier and they impart stable microstructure to Mg alloys in which secondary phases resisting extreme corrosion or wear conditions. Besides, shot peening is acceptable method to develop the surface strength of light materials such as aluminum or magnesium. In addition, micro arc oxidation (MAO) can be used as effective way to increase the corrosion and wear resistance of light materials. However, many studies about improving of corrosion or wear resistance of Mg alloys is limited at as-cast materials. In this study, we produced AZ31 Mg alloys containing Neodymium (Nd) and Lanthanum (La) elements as using of low pressure die casting method, following hot rolling was utilized to obtain 2 mm sheets which deformed at different rolling speed. After the hot rolling, some of the produced sheets was exposed directly MAO or some of them was exposed both shot peening and MAO. To examine the wear and corrosion resistance of materials the wear and corrosion tests were applied at dry condition and 3,5%NaCl solution at 25°C, respectively. The microstructure after coating was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Further, the surface properties were obtained by profilometer as surface roughness.